Hasselblad filters?

Hi everyone!

Just got a 500c/m with 80mm Opton, and I need to equip some filters. Which would you say are indispensable? I tend to shoot BW landscape and portraits.
Currently I have a Hasselblad red, with hasselblad mount. Is there any adaptor that would let me use my Tiffen filters? Have some left from Mamiya.